A US citizen, Kim Hak-Song, who was teaching at Pyongyang University of Sience and Technology (PUST), was taken into custody by the North Korean government on the counts of "hostile acts" against the North Korean government. Kim brings the total amount of US citizens who have been arrested in North Korea to 4. Another US citizen who was arrested 2 weeks ago was arrested in the airport and was also working for PUST. There are also 2 other Americans in custody whose situation is detailed within the article.